↑Refers to whether or not the pawn will die if a system's capacity becomes 'None'

↑Centipedes body rings are used for movement instead, since they don't have legs.

↑Again, Centipedes body rings are used for work instead, since they don't have arms.

↑Centipedes have no form of external communication. Scythers do have a neck though, and make some interesting sounds when incapacitated.

Sight

Sight is a capacity that contributes to stats including shooting accuracy, melee hit chance, and for colonists, nearly every work stat. Humans and animals have eyes, while scythers and centipedes have functionally equivalent sight sensors. Losing an eye or sensor reduces sight by 50%. Humans aged 60 or older may develop cataracts which drastically reduces sight by 70%. An eye can be upgraded with a bionic eye.

Hearing

Moving

Moving is a capacity that determines a pawn's movement speed. Nearly all pawns use legs to move about. A pawn's movement speed is reduced when a leg, foot, or toe is injured. A pawn may still move when feet or toes are missing, but becomes incapacitated when a leg is destroyed or missing. Movement is also reduced by ailments including dementia and frailty. Movement is reduced by certain clothing including jackets and parkas.

Manipulation

Manipulation is a pawn's capacity to handle a weapon or tool or to haul items. It is a factor of a pawn's shooting accuracy as well as nearly every work stat of a colonist. Manipulation is reduced by injured or missing arms, hands, or fingers. For quadrapeds, manipulation is reduced by injury to their spine. It is also reduced by ailments including bad back and frailty. Manipulation is modified by prosthetics including power claws, scyther blades, prosthetic arms, and bionic arms.

Eating

Eating is the capacity of biological pawns to consume food and is a major factor of Eating Speed. It is reduced by a damaged jaw and stomach. Even when missing a jaw or a stomach a pawn can still eat, though at a reduced rate. A damaged or missing jaw can be replaced with a denture.

Breathing

Breathing is impaired by damaged lungs. A character missing a lung has breathing reduced by 50% but can still survive. Without lungs, all breathing ceases and the organism will die. Lungs can be harvested and transplanted from other humans.

Breathing bears a small weight in the movement stat, hence why Asthmatics will be slightly slower than healthy colonists.

Blood Filtration

Blood Filtration is a function of a human's body provided by the kidneys. It is a major factor of Immunity Gain Speed and is therefore critical to keeping sick people alive.

Blood Pumping

Blood Filtration is a function of a human's body provided by the heart.

Metabolism

Metabolism is a pawn's rate of food consumption. Increased metabolism will cause it to consume food more often.
(In game however a higher metabolism percentage results in less sleep and food needed for the colonist)

Communication

Communication is a scyther's system that allows it to vocalize and communicate, although it has no actual impact on gameplay.

Data Processing

Data processing is carried out by a mechanoid's artificial brain and is the functional equivalent of a humanoid's brain function.

Consciousness

Consciousness is a creature's ability to remain active, and in the case of your colonists, controllable. Blood loss, starvation and pain can have a serious effect on a creature's consciousness if they reach higher levels. Pawns below 30% consciousness will not wake up.
When a medical operation is performed, anesthesia is induced, which renders the person unconscious until the effect of the anesthetic medication has worn off. This makes them incapable of moving, along with being incapable of leaving the bed.

Pain

Most biological creatures including colonists, raiders, and animals feel pain caused by injuries. A pawn's pain level ranges from 0% to 100% and is displayed on their Health tab's Overview. Pain levels are None, Little, Moderate, Severe, and Extreme. Even a little pain causes unhappy thoughts. Once pain passes 10%, it'll start to have an effect on consciousness. If a pawn's pain level meets or exceeds their Pain Shock Threshold they'll go into shock, unable to move. Pawns with the Wimp trait will be incapacitated with only minor pain of 15%.

Most pain is temporary, but scars and certain diseases can cause long-term pain. A painstopper implant will get rid of all a colonist's pain and negate any pain-related mood penalties. Note that colonists with the Masochist trait get a mood bonus from pain instead of a penalty, so it's usually better to leave them alone.

Health Tab

All creatures have a health tab, located above the pawn's inspect pane.

Overview tab

The first section lists the creature's type, gender and age. Hovering over this section will display the creature's exact age and date born.

The creature's bodily systems are listed here with their current effectiveness. Not all systems are found among all types of creatures (i.e. animals don't have Talking).

Operations tab

The Operations tab is only available for colonists, colony animals, and prisoners. Bills can be added here to request surgical operations.

Injuries

Listed here are the creature's health conditions and injuries. Implants, bionic parts, and prosthetics are also listed here. Hovering over an entry provides detailed information.

A red blood droplet indicates a bleeding injury. The size of the droplet indicates severity of the bleeding. Overall bleeding rate is listed at the bottom.

An open circle indicates a condition that needs tending, usually requiring periodic treatments before fully cured. A solid circle indicates the condition has been tended to.

A bandage icon indicates a treated injury. A white bandage indicates high quality treatment. Darker shades indicate lower quality treatment, more likely to result in scarring or infection. See Doctoring

Cold and Heat Injuries

Hypothermia: Causes a negative thought, and pawns will eventually lose consciousness.
Frostbite: Can cause limbs and fingers/toes to fall off.
Heatstroke: Causes a negative thought, and can affect consciousness and even set a pawn on fire.
Burns: Causes low-medium pain and creates a risk of infection.

Treatment

For most injuries, you can treat colonists with or without medicine (with typically better results if a medicinal substance is provided), and also have them lay in hospital beds or any other bed or sleeping spot assigned as a medical spot, though Hospital Beds further improve the chance of them being treated properly.

Improper Treatment

Operations

Under the Health tab, you can assign an operation to a colonist by clicking on the bill sub-tab. Operations cannot be performed without a proper Medkit to apply an anesthetic. Operation success chance depends highly on the doctor's skill level. Keep in mind that keeping the room as clean as possible (also optionally with the use of sterile tiles) will help preventing possible infection. As of Alpha 16, there are three categories of surgery failure – minor, catastrophic, and ridiculous. Ridiculous hits all body parts, minor and catastrophic hit parts near the surgery site.

Transplants

For missing internal organs, either a donor organ can be used or an artificial part. Some diseases can be cured through a transplant. Heart Disease can be cured with a heart transplant and asthma can be cured with lung transplants. Be wary that your colonists will suffer mood penalties when you harvest an organ unnecessarily (in particular the 'victim', this pentalty is -30 mood!).

Limb Replacement

From peg legs to bionic arms, you could either replace a colonists' missing limbs, augment them, or cruelly punish your enemies with peg legs out of spite.
Bionic parts have a bonus to specific actions or movement. For example, a bionic leg will increase your colonist's moving speed by 20%. Having a second bionic leg will increase the speed further by 20%, so having both right and left bionic legs will increase the speed by 40%.

Implants

You can install implants onto a natural part to improve its functions.
Implants are not mutually exclusive so you can have more than 1 per part.